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This CL adds the interface which will be implemented by bridge and
coordinator. The build file currently doesn't add the public_java
target to chrome_java since this would cause a cyclic dependency.


The interface allows to request that the TouchToFill component shows
a set of credentials and ensures that the delegate is notified when
users dismiss the sheet without selecting anything.

Bug: 957532,1004415
Change-Id: Icbba0471febb88dfb4f87d33a1ea4a53992767ff
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1798707
Commit-Queue: Friedrich [CET] <fhorschig@chromium.org>
Reviewed-by: David Trainor <dtrainor@chromium.org>
Reviewed-by: Jan Wilken Dörrie <jdoerrie@chromium.org>
Cr-Commit-Position: refs/heads/master@{#697960}